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Publication numberUS6270783 B1
Publication typeGrant
Application numberUS 09/559,894
Publication dateAug 7, 2001
Filing dateApr 26, 2000
Priority dateAug 13, 1999
Fee statusLapsed
Also published asCA2380638A1, EP1200061A1, WO2001012148A1
Publication number09559894, 559894, US 6270783 B1, US 6270783B1, US-B1-6270783, US6270783 B1, US6270783B1
InventorsCraig Stephen Slavtcheff, Alexander Paul Znaiden, Michael Indursky, Brian Andrew Crotty
Original AssigneeUnilever Home & Personal Care Usa, Division Of Conopco, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cosmetic strips with liquid crystal temperature dependent color change
US 6270783 B1
Abstract
An adhesive cosmetic strip is provided which includes a flexible water-insoluble substrate, an adhesive composition deposited onto the substrate, a liquid crystal thermochromic substance, and an agent interactive with water to ensure a temperature rise of at least 2° C. in the strip. The thermochromic substance may be impregnated into the substrate or dispersed within the adhesive composition. When applied to the skin, the strip is warmed by a reaction between water and an exothermic or endothermic agent held within the strip. Moisture within the skin or externally applied water penetrates the strip and will react with the agent to cause an increase in temperature. Subsequently this increase in temperature will induce a color change in the thermochromic substance.
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Claims(13)
What is claimed is:
1. An adhesive cosmetic strip for placement on skin comprising:
(i) a flexible water-insoluble substrate;
(ii) an adhesive composition deposited onto the substrate;
(iii) an agent interactive with water present in a sufficient quantity to induce a change of temperature in the strip of at least 2° C.; and
(iv) a liquid crystal thermochromic substance incorporated into at least one of the substrate or adhesive composition, the thermochromic substance changing color in response to the change of temperature, the adhesive composition allowing the substrate to adhere to the skin.
2. The strip according to claim 1 wherein the adhesive is selected from a dry-to-the-touch or a pressure-sensitive tacky adhesive.
3. The strip according to claim 1 wherein the thermochromic substance is incorporated into the substrate.
4. The strip according to claim 1 wherein the thermochromic substance is incorporated into the adhesive composition.
5. The strip according to claim 1 wherein the adhesive composition further comprises a skin treatment agent.
6. The strip according to claim 5 wherein the skin treatment agent is selected from the group consisting of herbal extracts, emulsifiers, Vitamins and keratolytic agents.
7. The strip according to claim 6 wherein the keratolytic agent is salicylic acid.
8. The strip according to claim 1 wherein the agent interactive with water undergoes an exothermic reaction to achieve the change of temperature.
9. The strip according to claim 8 wherein the agent interactive with water is selected from the group consisting of anhydrous silica, activated alumina, alumino silicates and combinations thereof.
10. The strip according to claim 9 wherein the amount of the agent interactive with water is present from about 1 to about 80% by weight of the adhesive composition.
11. The strip according to claim 1 wherein the agent interactive with water induces an endothermic reaction.
12. The strip according to claim 11 wherein the agent interactive with water is selected from ammonium chloride and xylitol.
13. A packaged adhesive cosmetic strip for placement on skin comprising:
(A) a pouch; and
(B) an adhesive cosmetic strip sealably packaged within the pouch and comprising:
(i) a flexible water-insoluble substrate;
(ii) an adhesive composition deposited onto the substrate;
(iii) an agent interactive with water present in a sufficient quantity to induce a change of temperature in the strip of at least 2° C.; and
(iv) a liquid crystal thermochromic substance incorporated into at least one of the substrate or adhesive composition, the thermochromic substance changing color in response to the change of temperature.
Description

This application claims the benefit of Provisional No. 60/148,774 filed Aug. 13, 1999.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention concerns cosmetic dermal strips or patches which provide consumers with a color change indicator as a sensorial signal.

2. The Related Art

Cosmetics are often provided with consumer perceivable sensorial signals. Most common of these signals are fragrances. Pleasing odor is often the single most important attribute inducing re-purchase by a consumer. Other sensorial attributes are also significant in cosmetic chemistry. Skinfeel of a product is highly important. Creams, lotions, gels and pastes often are judged for their efficacy by the tacticity of their feel. Silky, non-residue leaving cosmetics are much preferred over tacky ones, and the consumer may relate those aesthetics to actual pharmacological performance.

Sometimes the sensorial attribute is that of temperature. Coolness is imparted to toothpastes and aftershave lotions through the presence of camphor, menthol or menthol derivatives such as menthol lactate. Some formulations signal efficacy through a temperature increase. Inclusion of capsaicin, an alkaloid extracted from capsicum, gives a brief temperature rise sensation to the human neural system.

Dermal patches or strips have recently become popular as delivery vehicle systems for cosmetic compositions. For instance, WO 98/42303 (Crotty et al.) describes a dry-to-the-touch keratotic plug remover strip. Upon wetting, the strip turns tacky and mobile. This product is placed on the bridge of the nose or other areas of the face requiring keratotic plug removal. Within a short time period, water evaporates from the wetted adhesive forming a dry film. The consumer must then peel the film from the face along with unwanted plugs bonded thereto. Amounts of water applied by the consumer may vary. Drying times are therefore also variable. A sensorial signal would be helpful for the consumer to know when to begin the peel removal.

Exothermic and endothermic reactions are other sources of temperature signaling. U.S. Pat. No. 5,861,440 (Gohla et al.) reports use of sugars, especially xylitol, for inducing a cooling sensation when contacted with water. Generation of exothermic heat is reported in U.S. Pat. No. 4,379,143 (Sherry et al.), U.S. Pat. No. 4,626,550 (Hertzenberg), U.S. Pat. No. 4,362,715 (Strianse et al.) and U.S. Pat. No. 3,250,680 (Menkart et al.). Each of these patents employ an aluminosilicate interacting with water to release momentary heat.

Other types of sensorial signals have been sought for incorporation into cosmetics. The signals should either provide an independently new effect or complement those which have traditionally been employed.

Accordingly, it is an object of the present invention to provide cosmetic products, especially dermal strips or patches with a new sensorial signal.

Still another object of the present invention is to provide cosmetic products, especially dermal strips or patches with a sensorial signal which may augment other sensory or emotive aesthetics of such products.

Yet another object of the present invention is to provide cosmetic products, especially dermal strips or patches which include a timing mechanism for application, rub-in or removal of the product from a consumer's skin.

These and other objects of the present invention will become more readily apparent from consideration of the following summary and detailed discussion.

SUMMARY OF THE INVENTION

An adhesive cosmetic strip is provided for placement on skin which includes:

(i) a flexible water-insoluble substrate;

(ii) an adhesive composition deposited onto the substrate;

(iii) an agent interactive with water present in a sufficient quantity to induce a change of temperature in the strip of at least 2° C.; and

(iv) a liquid crystal thermochromic substance incorporated into at least one of the substrate or adhesive composition, the thermochromic substance changing color in response to the change of temperature.

DETAILED DESCRIPTION OF THE INVENTION

Now a visual sensorial signal has been found for use with dermal strips or patches. The invention is based upon the use of liquid crystal thermochromic substances whose color changes in response to a change in temperature. The substances may either be incorporated into the flexible substrate structurally supporting the strip or patch or may be formulated with the adhesive.

Liquid crystal thermochromic substances ordinarily are colorless (essentially transparent) except when in a specific temperature range, at which time they become visible. Often mixtures of these substances are employed to change different colors responsive to changes in temperature. They may be cholesteric or chiral nematic liquid crystals. Commercially the substances are available from Hallcrest of Glenview, Ill. Hallcrest has developed a silk-screenable liquid crystal material which is called a microencapsulated chiral nematic with vivid colors. Since the liquid crystal scatters light, it thus requires a generally dark background to be most visible. It changes through its liquid crystal visible color spectrum of clear to red to green to blue to purple to clear (as heated) or the reverse color sequence (when cooled). Temperature below its design temperature range, the liquid crystal substance is essentially transparent. Similarly, the temperature above its design temperature range, the liquid crystal material is also essentially transparent. Therefore, the liquid crystal material is only visible when at a temperature within the desired temperature range. Typical liquid crystals are cholesteryl ester carbonates or chiral nematic (non-sterol) aryl compounds. Particularly useful are (2-methylbutyl)phenol 4-alkyl(oxy)benzoates. Hallcrest provides microencapsulated thermochromic liquid crystals in sheet form with an adhesive backing under stock items R20C5W, R25C5W, R29C5W, R30C5W, R35C5W, R40C5W and R35C1W. Other types of liquid crystals which may be useful for the present invention are mentioned in WO 91/09106 (El-Nokaly et al.), U.S. Pat. No. 5,705,093 (Coates et al.) and U.S. Pat. No. 5,690,857 (Osterried et al.). Amounts of the liquid crystal in strips of the present invention may range from about 0.00001 to about 20%, preferably from about 0.01 to about 10%, optimally about 0.5 to about 5% by weight of the strip.

Liquid crystal thermochromic substances of the present invention will be capable of operating across many temperature change windows. Some windows may be as small as 0.5° C. while others may range as high as 20° C.

Flexible water-insoluble substrates are another essential element of the present invention. By “water insoluble” is meant that the substrate does not dissolve in or readily break apart upon immersion in water. A wide variety of materials can be used as the substrate.

Nonlimiting examples of suitable substrates include nonwoven substrates, woven substrates, hydroentangled substrates, air entangled substrates and the like. Preferred embodiments employ nonwoven substrates since they are economical and readily available in a variety of materials. By nonwoven is meant that the layer is comprised of fibers which are not woven into a fabric but rather are formed into a sheet, particularly a tissue. The fibers can either be random (i.e., randomly aligned) or they can be carded (i.e. combed to be oriented in primarily one direction). Furthermore, the nonwoven substrate can be composed of a combination of layers of random and carded fibers.

Nonwoven substrates may be comprised of a variety of materials both natural and synthetic. By natural is meant that the materials are derived from plants, animals, insects or byproducts. By synthetic is meant that the materials are obtained primarily from various man-made materials or from material that is usually a fibrous web comprising any of the common synthetic or natural textile-length fibers, or mixtures thereof.

Nonlimiting examples of natural materials useful in the present invention are silk fibers, keratin fibers and cellulosic fibers. Nonlimiting examples of keratin fibers include those selected from the group consisting of wool fibers, camel hair fibers, and the like. Nonlimiting examples of cellulosic fibers include those selected from the group consisting of wood pulp fibers, cotton fibers, hemp fibers, jute fibers, flax fibers, and mixtures thereof. Wood pulp fibers are preferred.

Nonlimiting examples of synthetic materials useful in the present invention include those selected from the group consisting of acetate fibers, acrylic fibers, cellulose ester fibers, modacrylic fibers, polyamide fibers, polyester fibers, polyolefin fibers, polyvinyl alcohol fibers, rayon fibers and mixtures thereof. Examples of some of these synthetic materials include acrylics such as Acrilan®, Creslan®, and the acrylonitrile-based fiber, Orion®; cellulose ester fibers such as cellulose acetate, Arnel®, and Acele®; polyamides such as Nylons (e.g., Nylon 6, Nylon 66, Nylon 610 and the like); polyesters such as Fortrel®, Kodel®, and the polyethylene terephthalate fibers, Dacron®; polyolefins such as polypropylene, polyethylene; polyvinyl acetate fibers and mixtures thereof.

Nonwoven substrates made from natural materials consist of webs or sheets most commonly formed on a fine wire screen from a liquid suspension of the fibers.

Nonwoven substrates made from synthetic materials useful in the present invention can be obtained from a wide variety of commercial sources. Nonlimiting examples of suitable nonwoven layer materials useful herein include HEF 40-047, an apertured hydroentangled material containing about 50% rayon and 50% polyester, and having a basis weight of about 43 grams per square yard (gsy), available from Veratec, Inc., Walpole, Mass.; HEF 140-102, an apertured hydroentangled material containing about 50% rayon and 50% polyester, and having a basis weight of about 56 gsy, available from Veratec, Inc., Walpole, Mass.; Novenet® 149-191, a thermo-bonded grid patterned material containing about 69% rayon, about 25% polypropylene, and about 6% cotton, and having a basis weight of about 100 gsy, available from Veratec, Inc., Walpole, Mass.; HEF Nubtex® 149-801, a nubbed, apertured hydroentangled material, containing about 100% polyester, and having a basis weight of about 70 gsy, available from Veratec, Inc. Walpole, Mass.; Keybak® 951V, a dry formed apertured material, containing about 75% rayon, about 25% acrylic fibers, and having a basis weight of about 43 gsy, available from Chicopee Corporation, New Brunswick, N.J.; Keybak® 1368, an apertured material, containing about 75% rayon, about 5% polyester, and having a basis weight of about 39 gsy, available from Chicopee Corporation, New Brunswick, N.J.; Duralace® 1236, an apertured, hydroentangled material, containing about 100% rayon, and having a basis weight from about 40 gsy to about 115 gsy, available from Chicopee Corporation, New Brunswick, N.J.; Duralace® 5904, an apertured, hydroentangled material, containing about 100% polyester, and having a basis weight from about 40 gsy to about 115 gsy, available from Chicopee Corporation, New Brunswick, N.J.; Sontaro® 8868, a hydroentangled material, containing about 50% cellulose and about 50% polyester, and having a basis weight of about 60 gsy, available from Dupont Chemical Corp.

Substrates of the present invention need not be formed of fibers. They may be cast as plastic films such as polyethylene, polyester, polyurethane, polyvinyl chloride, polyamide, cellophane, or metallic foils.

The water insoluble substrates of the present invention can comprise two or more layers. They may be of similar construction or have different texture and abrasiveness. The differing textures can result from the use of different combinations of materials or from the use of a substrate having a smooth surface and a more abrasive opposite surface. Combinations of hydrophilic and hydrophobic layers may be useful for certain products of this invention. Likewise there may be desired combination of fluid absorptive and non-absorptive layers.

A further important element of cosmetic strips according to the present invention is that of an adhesive composition deposited onto the substrate. The adhesive may be of the pressure sensitive variety or may be a dry-to-the-touch film whose tacticity is generated by adding a small amount of water at the point of use.

Pressure sensitive adhesives may be formed from a variety of natural and synthetic adhesive polymers. The natural ones may be based on starch or modified starches. Synthetic adhesives include polyvinyl acetate, polyvinyl chloride, polyurethane, polyamide, but most especially acrylic-based polymers. The acrylics may be homo- or co-polymers (the latter indicating at least two different monomer units within the polymer chain). Typical monomers for use in acrylic-based polymers include acrylic acid, methacrylic acid, ethylacrylate, methylacrylate, butylacrylate and combinations thereof. These may be obtained under the trademark Gelva® series sold by Monsanto and the Duro-Tak® series sold by the National Starch and Chemical Company. Most preferred are acrylic polymers available from Lohmann Therapie Systeme, Germany. Silicone-based polymers may also be employed such as Bio-Psa silicones sold by the Dow Corning Corporation.

Release or backing liners are usually placed over the adhesive layer. The release liner should have a surface that is easily stripped off or released prior to use of the strip. Suitable materials for this liner include polyvinylchloride, polyester, polyvinylidene chloride, polystyrene, polyethylene and paper, all of which are preferably but not necessarily coated with a silicone formulation.

Another type of adhesive suitable for the present invention is a dry-to-the-touch substance. Products based on this technology are often intended as keratotic plug (e.g. blackhead) removers from facial pores. In a dry state, the adhesive composition is non-tacky to the touch. The adhesive is activated by either directly wetting the composition on the sheet or indirectly by wetting the face in areas to be contacted by the composition. In either instance, the wetting agent interacts with the adhesive composition so it becomes tacky and sufficiently mobile to flow into skin pores. Pure water is the preferred wetting agent. However, other fluid systems or gels could be employed. Suitable fluids would include alcohols such as ethanol, propanol, propylene glycol, polyethylene glycol, polypropylene glycol and especially mixtures of these alcohols with water. Gels would normally consist of fluid (particularly water) and structuring agents such as Carbomer.

Subsequent to wetting, the adhesive composition is allowed to dry over the area of treatment. During drying keratotic plugs stickingly adhere to the composition. Advantageously the drying period ranges from 1 minute to 5 hours, preferably from 5 minutes to 1 hour, optimally from 10 to 20 minutes. Thereafter, the dried composition with adhered plugs is peeled from the skin.

The dry-to-the-touch adhesive composition will include a polymer which may either be anionic, nonionic, cationic, amphoteric or mixtures thereof. Further, there may be utilized combinations of different polymers from within the same type. Examples of nonionic polymers suitable for film deposition are the copolymers of vinyl acetate and crotonic acid, terpolymers of vinyl acetate, crotonic acid and a vinyl ester of an alpha-branched saturated aliphatic monocarboxylic acid such as vinyl neodecanoate; copolymers of methyl vinyl ether and maleic anhydride (molar ratio about 1.1) wherein such copolymers are 50% esterified with a saturated alcohol containing from 1 to 4 carbon atoms such as ethanol or butanol; and acrylic copolymers, terpolymers, etc., containing acrylic acid or methacrylic acid, esters of acrylic or methacrylic acid with one or more saturated alcohols having from 1 to 22 carbon atoms such as methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-butyl acrylate, t-butyl acrylate, t-butyl methacrylate, n-butyl methacrylate, n-hexyl acrylate, n-octyl acrylate, lauryl methacrylate and behenyl acrylate, glycols having from 1 to 6 carbon atoms such as hydroxypropyl methacrylate and hydroxyethyl acrylate, styrene, vinyl caprolactam, vinyl acetate, acrylamide, alkyl acrylamides and methacrylamides having 1 to 8 carbon atoms in the alkyl group such as methacrylamide, t-butyl acrylamide and n-octyl acrylamide, and other compatible unsaturated monomers. One specific example is the emulsion polymerized terpolymer of methacrylic acid, n-butyl acrylate and ethyl acrylate (e.g., in a weight percent ratio of 31:42:27, respectively).

Further examples of nonionic film forming adhesive polymers are homopolymers of N-vinylpyrrolidone and copolymers of N-vinylpyrrolidone with compatible nonionic monomers such as vinyl acetate and terpolymers of ethyl acrylate, butyl methacrylate and methyl methacrylate. Nonionic polymers containing N-vinylpyrrolidone in various weight average molecular weights are available commercially from ISP Corporation such as homopolymers of N-vinylpyrrolidone having an average molecular weight of about 630,000 under the trademark PVP K-90 and those having an average molecular weight of about 1,000,000 sold under the trademark of PVP K-120. Particularly preferred is poly(methyl vinyl ether/maleic anhydride) as an unneutralized resin available from ISP Corporation under the trademark Gantrez® S-97 BF and polyvinylformamide available from the National Starch and Chemical Company, Division of ICI.

Anionic film forming adhesive polymers often are derived from the nonionic types which include carboxylic acid functions. Alkaline agents are employed to neutralize the carboxylic acid or anhydride transforming them into anionic salts. Examples of suitable neutralizing agents include 2-amino-2-methyl-1,3-propanediol (AMPD); 2-amino-2-ethyl-1,3-propanediol (AEPD); 2-amino-2-methyl-1-propanol (AMP); 2-amino-1-butanol (AB); monoethanolamine (MEA); diethanolamine (DEA); triethanolamine (TEA); monoisopropanolamine (MIPA); diisopropanol-amine (DIPA); triisopropanolamine (TIPA); and dimethyl stearamine (DMS). Most preferred is AMP.

Particularly preferred anionic polymers are the salts of poly(methyl vinyl ether/maleic anhydride) and polystyrene sulfonic acid. The former is obtained by at least partial neutralization of Gantrez® S-97 BF and the latter available from the National Starch & Chemical Company under the trademarks Versa TL-501 and Flexan® 130 having respective molecular weights of about 500,000 and 100,000. Other polymer films which may be employed and are commercially available are listed in the Table below.

TABLE
POLYMER
TRADEMARKS
(SUPPLIER) CTFA DESIGNATIONS
Resyn ® 28-1310 (NSC) Vinyl acetate/crotonic acid copolymer
Resyn ® 28-2930 (NSC) Vinyl acetate/crotonic acid/vinyl
neodecanoate copolymer
Resyn ® 28-2913 (NSC) Vinyl acetate/crotonic acid/vinyl
neodecanoate copolymer
Versatyl ® 40 (NSC) Octylacrylamide/acrylates copolymer
Versatyl ® 42 (NSC) Octylacrylamide/acrylates copolymer
Experimental Resin (NSC) Vinyl acetate/vinyl neodecanoate/maleic
half-ester
Ultrahold-8 ® (BASF) Acrylate/acrylamide copolymer
Luviset ® CAP (BASF) Vinyl acetate/crotonic acid/vinyl propionate
copolymer
PVP K-30 (ISP) PVP
PVP/VA E-335 (ISP) PVP/Vinyl acetate copolymer
PVP/VA E-735 (ISP) PVP/Vinyl acetate copolymer
Gantrez ® ES-225 (ISP) Ethyl ester of PVM/MA copolymer
Gantrez ® ES-425 (ISP) Butyl ester of PVM/MA copolymer
Gaffix ® VC-713 (ISP) Vinyl caprolactam/PVP/dimethyl aminoethyl
methacrylate copolymer

Cationic adhesive polymers suitable for the present invention may be prepared as homo- or copolymers from monomers including:

Dimethyl aminoethyl acrylate (DMAEA), Dimethylaminoethyl methacrylate (DMAEMA), Dimethylaminopropylacrylamide (DMAPAAm), and Dimethylaminopropyl methacrylamide (DMAPMAAm) which are all (meth)acrylamides or (meth)acrylic acid esters having a dialkylamino group;

Dimethylaminostyrene (DMASt) and Dimethyaminomethylstyrene (DMAMSt) and the like which are styrenes having a dialkylamino group;

4Vinyl pyridine and 2-vinyl pyridine which are vinyl pyridines; and

Quaternized products of these with a known quaternizing agent such as alkyl halide, benzyl halide, alkyl or aryl sulfonic acid, or dialkyl sulfate.

Among suitable amphoteric adhesive polymers are those derived from monomers such as:

N-(3-sulfopropyl)-N-acryloyloxyethyl-N,N-dimethylammonium betaine, N-(3-sulfopropyl)-N-methacroylamidepropyl-N,N-dimethylammonium betaine, N-(3-carboxymethyl)-N-methacroylamidepropyl-N,N-dimethylammonium betaine and N-carboxymethyl-N-methacroyloxyethyl-N,N-dimethylammonium betaine.

When the salt forming group of the cationic and amphoteric polymers is not ionized, it is preferred to ionize it via neutralization with known acids such as hydrochloric acid and sulfuric acid which are inorganic acids; acetic acid, propionic acid, lactic acid, succinic acid, glycol acid which are organic acids, or with known bases such as triethylamine, trimethylamine which are tertiary amines; ammonia; or sodium hydroxide.

Relative amounts of water-insoluble substrate to adhesive composition may vary in the relative weight range from about 1,000:1 to about 1:1,000, preferably from about 100:1 to about 1:100, optimally from 20:1 to about 1:20, more optimally from about 5:1 to about 1:5 by weight.

A further element of the present invention is in an agent interactive with water to generate a change of temperature, the agent being admixed with the adhesive polymer. These agents should be capable of an exothermic or endothermic temperature jump of at least about 2° C., preferably about 5° to about 30° C., more preferably from about 8° to about 20° C., even more preferably from about 10° to about 15° C.

Illustrative of the exothermic reaction inducing agents are anhydrous silica, activated alumina, aluminosilicates (e.g. zeolites) and combinations thereof. Particularly preferred are aluminosilicates such as Zeolite A available from PQ Corporation and Cab-O-Sil® fumed silica available from the Cabot Corporation. Examples of endothermic agents are ammonium chloride and xylitol. Amounts of these substances may range from about 1 to about 80%, preferably from about 10 to about 60%, optimally from about 15 to about 40% by weight of the adhesive composition. When incorporating a water sensitive temperature change inducing agent, precaution should be employed to maintain the strip within packaging (e.g. sealed pouch or packet) that avoids exposure to moisture or at least excessive moisture.

A variety of skin treatment agents may be formulated with the adhesive compositions. These agents may include moisturizers, preservatives, herbal extracts, vitamins, anti-irritant agents, emulsifiers and keratolytic agents.

Polyhydric alcohols also known as polyols are the most useful moisturizers. Representative polyols include glycerine, diglycerine, propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol and derivatives thereof, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1,2-butylene glycol, 1,2,6-hexanetriol, isoprene glycol, 2-methyl-1,3-propanediol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. Amounts of the polyol may range from about 0.1 to about 95%, preferably from about 1 to about 50%, more preferably from about 1.5 to about 20%, optimally from about 3 to about 10% by weight of the adhesive composition.

Preservatives can desirably be incorporated into the adhesive compositions to protect against the growth of potentially harmful microorganisms. Suitable preservatives include alkyl esters of para-hydroxybenzoic acid, hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Cosmetic chemists are familiar with appropriate preservatives and routinely choose them to satisfy the preservative challenge test and to provide product stability. Particularly preferred preservatives are phenoxyethanol, methyl paraben, propyl paraben, imidazolidinyl urea, sodium dehydroacetate and benzyl alcohol. Preservatives are preferably employed in amounts ranging from about 0.01% to about 2% by weight of the composition.

Herbal extracts may include Roman Chamomile, Green Tea, Scullcap, Nettle Root, Swertia Japonica, Fennel, Anise, Arnica, Calandula, Coltsfoot, Cornflower, Elder, Gentian, Hawthorn, Lavender, Linden, Myrrh, Oat, Rose, Sweet Clover, Sandalwood, Vetiver, Tulsi, Kamala, Eucalyptus, St. John's Wort and Aloe Vera extracts. Amount of each of the extracts may range from about 0.00001 to about 1%, preferably from about 0.01 to about 0.5%, optimally from about 0.05 to about 0.2% by weight of the adhesive composition.

Vitamins useful in products of the present invention include Vitamin E Acetate, Vitamin C, Vitamin A Palmitate, Panthenol and any of the Vitamin B complexes. Anti-irritant agents may also be present including those of alpha-bisabolol and potassium glycyhrrizzinate, each vitamin or anti-irritant agent being present in amounts ranging from about 0.001 to about 0.5%, preferably from about 0.01 to about 0.1% by weight of the adhesive composition.

Emulsifiers may also be incorporated into the cosmetic strips of this invention. These emulsifiers may be anionic, nonionic, cationic, amphoteric and combinations thereof. Useful nonionic type emulsifiers include the C10-C20 fatty alcohol or acid hydrophobes condensed with from 2 to 100 moles of ethylene oxide or propylene oxide per mole of hydrophobe; C2-C10 alkyl substituted phenols condensed with from 2 to 20 moles of alkylene oxide; mono- and di-fatty acid esters of ethylene glycol; fatty acid monoglyceride; sorbitan, mono- and di-C8-C20 fatty acids; block copolymers (ethylene oxide/propylene oxide); and polyoxyethylene sorbitan as well as combinations thereof. Alkyl polyglycosides and saccharide fatty amides (e.g. methyl gluconamides) are also suitable nonionic emulsifiers. Amounts of the emulsifiers may range from about 0.1 to about 30%, preferably from about 0.5 to about 10% by weight of the adhesive composition.

Keratolytic agents may also be incorporated into the adhesive compositions. Typical of these agents are the alpha and beta hydroxycarboxylic acids. The alpha-hydroxycarboxylic acids include glycolic acid, malic acid, lactic acid and mixtures thereof as well as their salts such as alkali metal and ammonium salts. The most preferred beta hydroxycarboxylic acid is salicylic acid. Amounts of these keratolytic agents may range from about 0.01 to about 15%, preferably from about 1 to about 12% by weight of the adhesive composition.

Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material ought to be understood as modified by the word “about”.

The following examples will more fully illustrate the embodiments of this invention. All parts, percentages and proportions referred to herein and in the appended claims are by weight unless otherwise illustrated.

EXAMPLE 1

A dry-to-the-touch strip is prepared for use in removing keratotic plugs from skin pores. The strip employed is a 70:30 rayon/polyester nonwoven fabric available from Dupont. Poly(methyl vinyl ether maleic anhydride), commercially available as Gantrez S-97® is employed as the adhesive. The resin is dispersed in water along with Microencapsulated Cholesteryl Ester Carbonate (liquid crystal), titanium dioxide, silica and 2-amino-2-methyl-1-propanol (AMP). The mixture is coated by a knife-over-roll onto the nonwoven substrate. After coating, the strip and adhesive composition are dried at 75° C. in a convection oven. The dried sheet is then cut into small strips. The adhesive composition is dry-to-the-touch and has a composition as listed in Table I.

TABLE I
COMPONENT WEIGHT %
Gantrez S-97 ® 68.1
Anhydrous Silica 20.0
AMP 7.0
Microencapsulated Cholesteryl Ester 3.9
Carbonate
Titanium Dioxide 1.0

EXAMPLE 2

Another dry-to-the-touch strip for removing keratotic plugs from skin pores is prepared employing a polyester/cellulose wet layed nonwoven fabric. Poly(vinylformamide) available from the National Starch and Chemical Company is taken as the adhesive in combination with anhydrous silica, titanium dioxide, Vitamin C (ascorbic acid), glycerin, dimethicone copolyol, methoxypropyl glucamide and disodium EDTA. The mixture is coated by a knife-over-roll onto the nonwoven substrate. After coating, the strip and adhesive composition are dried at 75° C. in a convection oven. The dried sheet is then cut into small strips. The adhesive composition is dry-to-the-touch and has a composition as listed in Table II.

A sheet of Hallcrest® R20C5W encapsulated thermochromic liquid crystal is attached through a pressure sensitive adhesive backing onto a surface of the fabric opposite the dry layed adhesive.

TABLE II
COMPONENT WEIGHT %
Polyvinylformamide 52.0
Anhydrous Silica 42.0
Glycerin 1.5
Dimethicone Copolyol 1.3
Vitamin C 1.0
Titanium Dioxide 1.0
Disodium EDTA 0.8
Methoxypropylglucamide 0.4

Just prior to use, the dry adhesive side of the resultant cosmetic strip is wetted. Anhydrous silica present in the composition reacts with the water generating a substantial exotherm. This heat transfers to the liquid crystal layer causing a change in color.

EXAMPLE 3

This example illustrates a cationic type dry-to-the-touch strip used for the removal of keratotic plugs from skin pores. The substrate employed is a 100% cellulose non-woven fabric. Components of the adhesive as listed under Table III are combined in methanol with stirring and after full dispersion of the components coated onto the cellulose substrate. Thereafter the system is dried to remove the methanol solvent. The dried sheet is then cut into small strips.

A consumer utilizes the strips by wetting face and then applying the strip to the face. Heat is generated by reaction of water with anhydrous zeolite. The temperature increase causes the microencapsulated liquid crystal to change color thereby signaling the time period necessary for maturation (drying) of strip over the skin pores. Once dried, the strip is peeled. Plugs adhere to the peel being thereby removed from the pores.

TABLE III
COMPONENT WEIGHT %
Poly-2-acrylamide-2-methylpropane 32.0
sulphonate
Zeolite 45.0
Glycerin 15.0
Perfume 5.0
Polyoxyethylene Hydrogenated Castor Oil 1.0
(60 EO Adduct)
Microencapsulated Cholesteryl Ester 2.0
Carbonate (Hallcrest)

EXAMPLE 4

This example illustrates an embodiment utilizing a pressure sensitive adhesive type of dermal patch. A silicone pressure sensitive adhesive is prepared by condensing at about 115° C. a siloxane resin copolymer with hydroxyl terminated polydimethyl siloxane in xylene solution in the presence of anhydrous ammonium. The resultant silicone adhesive in an amount of 55% is combined with 35% finely powered silica, 5% ascorbic acid and 5% Microencapsulated Cholesteryl Ester Carbonate. The combination is deposited onto a polypropylene film to form a dermal patch. A Mylar® backing sheet is placed over the pressure-sensitive adhesive composition for storage and shipping purposes.

Just prior to use, the Mylar® backing is removed. Water is applied to an area of the skin onto which the patch is to be placed. Heat generated by the reaction of water with the zeolite causes the liquid crystal to change color.

EXAMPLE 5

Another pressure sensitive adhesive strip is prepared for topical treatment of acne. A breathable polyurethane film (Bertek Medfilm 390) serves as a substrate sheet for an adhesive composition. An easy release silicon coated polystyrene film is then placed over the adhesive layer. The final thickness of the dried matrix is between 75 and 150 μm. Circular patches are then cut from the resultant multi-layered laminate. The formulation of the adhesive composition is outlined under Table IV.

TABLE IV
COMPONENT WEIGHT %
Polyacrylic Adhesive Resin 66.0
Sodium Aluminosilicate 30.0
Salicylic Acid 0.6
Glycolic Acid 0.4
Sorbitan Monooleate 1.0
Microencapsulated Cholesteryl Ester 1.0
Carbonate
Alpha-bisabolol 0.5
Potassium Glycyrrhizinate 0.5

EXAMPLE 6

Microencapsulated pellets of Cholesteryl Ester Carbonate (5%) are combined with polypropylene pellets and extruded through a plastic extruder to form a sheet of thermocolor impregnated plastic substrate. Onto this substrate is deposited an acrylic based pressure-sensitive adhesive formulated with 2% lactic acid. Over the adhesive layer is applied a release liner covering the tacky adhesive until ready for use when the liner is peeled away.

EXAMPLE 7

An aqueous dispersion of cholesteryl ester liquid crystal is spread onto a cellulose non-woven substrate sheet. The sheet is dried in a convection oven to remove water and have the liquid crystal thermochromic agent deposited into the cellulose substrate. Thereafter pressure-sensitive acrylic-based resin is applied. Mixed within the acrylic-based resin is 40% of powdered, finely dispersed zeolite and 2% salicylic acid. A release liner film is applied over the adhesive. When ready for use, the liner is removed, and the adhesive strip applied to the face. Over several hours, perspiration penetrates the adhesive layer, interacts with the zeolite and thereby emits a heat of reaction. This reaction causes the thermochromic agent impregnated into the cellulosic strip to turn from blue to colorless. The color change indicates to a user the minimum time required for the strip to release its active amount of anti-acne salicylic acid agent.

The foregoing description and examples illustrate selected embodiments of the present invention. In light thereof variations and modifications will be suggested to one skilled in the art, all of which are within the spirit and purview of this invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3250680Jul 19, 1960May 10, 1966Gillette CoHeat-generating cosmetic composition
US3995088 *Jan 23, 1975Nov 30, 1976Ciba-Geigy CorporationCoated pressure-sensitive recording material
US4362715Dec 5, 1980Dec 7, 1982Pq CorporationZeolites, carboxyvinyl polymer
US4379143Feb 1, 1982Apr 5, 1983Pq CorporationTopical liquid or ointment
US4532937 *Nov 28, 1983Aug 6, 1985Cuderm CorporationSebum collection and monitoring means and method
US4626550Oct 7, 1985Dec 2, 1986Pq CorporationZeolite for personal care products
US4642250Jan 13, 1986Feb 10, 1987Donald SpectorFabrics and garments formed thereby having thermally-sensitive chromatic properties
US5861440Apr 13, 1994Jan 19, 1999Beiersdorf AktiengesellschaftCosmetic and medicinal topical preparations
US5871763 *Apr 24, 1997Feb 16, 1999Fort James CorporationSubstrate treated with lotion
US5935900 *Aug 14, 1997Aug 10, 1999Ojl Paper Co., Ltd.Heat sensitive recording material
FR2205303A1 Title not available
GB1597388A Title not available
WO1993008793A1Oct 27, 1992May 13, 1993Boots Co PlcToiletries composition
WO1997032567A1Feb 28, 1997Sep 12, 1997Kao CorpSheet pack
WO1997048387A1Jun 19, 1997Dec 24, 1997Lavipharm SaDevice for topical treatment of acne and its method of manufacture
WO1998042303A1Mar 10, 1998Oct 1, 1998Unilever PlcCosmetic product
Non-Patent Citations
Reference
1International Search Report.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6572878 *Sep 7, 2000Jun 3, 2003Robert BlaineMethod and device for treating scars
US6733766May 6, 2002May 11, 2004Unilever Home & Personal Care Usa, Division Of Conopco, Inc.Personal care composition with color change indicator
US6875444 *Oct 29, 2001Apr 5, 2005Unilever Home & Personal Care Usa, Division Of Conopco, Inc.Radiation transparent strip with adhesive surface; measuring efficiency of antiaging cosmetics
US6926904 *Oct 29, 2001Aug 9, 2005Unilever Home & Personal Care Usa, Division Of Conopco, Inc.Test device includes a mechanism for evaluating progress of the combat against the signs of aging occurring over a period of time within which the composition is applied to an area of skin being monitored.
US7008620Sep 30, 2002Mar 7, 2006Johnson & Johnson Consumer Companies, Inc.Mixture of oxidizer and reducing agents; exothermic reaction when wetting with water
US7033581Jul 10, 2003Apr 25, 2006Unilever Home & Personal Care Usa Division Of Conopco, Inc.Cap is a woven or nonwoven substrate impregnated, or coated with a mutable dye such as a leuco dye, which changes color when heated to indicate that a heat activatable hair treatment agent in the hair has been activated
US7170481Jan 28, 2005Jan 30, 2007Kent Displays IncorporatedSingle substrate liquid crystal display
US7236151Dec 7, 2004Jun 26, 2007Kent Displays IncorporatedLiquid crystal display
US7361361Dec 19, 2006Apr 22, 2008Georgia-Pacific Consumer Products LpWaterless lotion and lotion-treated substrate
US7452547 *Mar 31, 2004Nov 18, 2008Johnson&Johnson Consumer Co., Inc.Product for treating the skin comprising a polyamine microcapsule wall and a skin lightening agent
US7704522Sep 6, 2005Apr 27, 2010Clyde MorganGels based on menthol and camphor further comprise a source of oxygen, sodium chlorite, spirulina (blue-green algae) to improve the metabolism and to extend the duration of the effect; bioavailability; analgesics; diabetic neuropathy, scleroderma, psoriasis, strain, antispasmodic agents; etc.
US7737928Jan 28, 2005Jun 15, 2010Kent Displays IncorporatedStacked display with shared electrode addressing
US7773064Jan 28, 2005Aug 10, 2010Kent Displays IncorporatedLiquid crystal display films
US7791700Sep 16, 2005Sep 7, 2010Kent Displays IncorporatedLiquid crystal display on a printed circuit board
US7796103Jan 28, 2005Sep 14, 2010Kent Displays IncorporatedDrapable liquid crystal transfer display films
US7798706Aug 29, 2006Sep 21, 2010Cups Unlimited, LlcTemperature-indicating container
US8012495Dec 8, 2005Sep 6, 2011Georgia-Pacific Consumer Products LpLotion-treated tissue and towel
US8048447Sep 18, 2008Nov 1, 2011Clyde MorganTopical medicament
US8134042Dec 14, 2007Mar 13, 2012Kimberly-Clark Worldwide, Inc.Wetness sensors
US8138138Jul 8, 2010Mar 20, 2012Ecolab Usa Inc.Solidification matrix using a polycarboxylic acid polymer
US8198228Jan 4, 2008Jun 12, 2012Ecolab Usa Inc.Solidification matrix using an aminocarboxylate
US8199086Jul 1, 2008Jun 12, 2012Kent Displays IncorporatedStacked color photodisplay
US8318654Nov 30, 2006Nov 27, 2012Kimberly-Clark Worldwide, Inc.a biocide that heats to a temperature to effectively disinfect while also indicating the point at which proper cleaning has been achieved; visual evidence; wax encapsulated electrolyte salt that undergoes an exothermic reaction when contacted with water; leuco dye
US8329058Jun 13, 2007Dec 11, 2012Kent Displays IncorporatedChiral nematic photo displays
US8338352Jan 24, 2011Dec 25, 2012Ecolab Usa Inc.Solidification matrix
US8388992Mar 26, 2007Mar 5, 2013Georgia-Pacific Consumer Products LpAnti-microbial hand towel with time-delay chromatic transfer indicator and absorbency rate delay
US8389464Feb 14, 2012Mar 5, 2013Ecolab Usa Inc.Solidification matrix using a polycarboxylic acid polymer
US8530403 *Nov 20, 2009Sep 10, 2013Ecolab Usa Inc.Solidification matrix using a maleic-containing terpolymer binding agent
US8530720Jul 12, 2012Sep 10, 2013Aluminaid International AgThermally conductive, metal-based bandages to aid in medical healing and methods of use
US8541034Oct 3, 2007Sep 24, 2013Clyde E. MorganElectrical producing creams
US8759269Jul 19, 2010Jun 24, 2014Ecolab Usa Inc.Solidification matrix including a salt of a straight chain saturated mono-, di-, and tri- carboxylic acid
US20100272784 *Apr 23, 2010Oct 28, 20103M Innovative Properties CompanyWater-soluble pressure sensitive adhesives
EP1407762A1 *Sep 29, 2003Apr 14, 2004Johnson & Johnson Consumer Companies, Inc.Exothermic article and the use thereof
WO2003024267A2Sep 10, 2002Mar 27, 2003Lever Hindustan LtdMethod of treating hair with heat and a cap which provides a signal regarding treatment
WO2003062088A1 *Jan 21, 2003Jul 31, 2003Beiersdorf AgTemperature-indicating packing materials
WO2006070134A2 *Dec 23, 2005Jul 6, 2006Rhodia Recherches & TechSilicone material for releasing an active molecule
Classifications
U.S. Classification424/402, 424/77, 424/10.3, 424/445, 424/443, 424/10.1, 424/400, 424/447
International ClassificationA61K8/02, A61Q19/00
Cooperative ClassificationA61K8/0208, A61K2800/242, A61Q19/00, A61K2800/438
European ClassificationA61K8/02, A61K8/02C, A61Q19/00
Legal Events
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Sep 24, 2013FPExpired due to failure to pay maintenance fee
Effective date: 20130807
Aug 7, 2013LAPSLapse for failure to pay maintenance fees
Mar 20, 2013REMIMaintenance fee reminder mailed
Feb 9, 2009FPAYFee payment
Year of fee payment: 8
Feb 7, 2005FPAYFee payment
Year of fee payment: 4
Aug 28, 2000ASAssignment
Owner name: UNILEVER HOME & PERSONAL CARE USA, DIVISION OF CON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SLAVTCHEFF, CRAIG STEPHEN;ZNAIDEN, ALEXANDER PAUL;INDURSKY, MICHAEL;AND OTHERS;REEL/FRAME:011141/0631;SIGNING DATES FROM 20000331 TO 20000412